Prevent double insert database error. Fixes #49.
Merge pull request #51 from pinittome/issue-49

Prevent double insert database error. Fixes #49.
If user record already exists then remove before adding
Remove user entries already in place.
Only attempt to join board a reduced number of times
Merge pull request #52 from pinittome/issue-50

Fixes #50
Update to version 0.2.1 for release
Fix issue with main.js building